I cut the top off, scraped out the orange insides, rinsed them, carved them and filled them with fruit like blueberries, raspberries, bananas, grapes and pineapple. Put the top back on and serve chilled. This was my own idea from last year, but I have recently seen this on Pinterest that puts a slit in the top and puts a small green spoon through (like a stem, I guess).
disclosure: getting the orange insides is harder than it seems and takes the most time. Otherwise, this is super easy and would be super cute to send to school for a snack :)